16.5. Template Specializations
It is not always possible to write a single template that is best suited for every possible template argument with which the template might be instantiated. In some cases, the general template definition is simply wrong for a type: The general definition might not compile or might do the wrong thing. At other times, we may be able to take advantage of some specific knowledge to write more efficient code than would be instantiated from the template. When we can’t (or don’t want to) use the template version, we can define a specialized version of the class or function template.
Our compare function is a good example ...
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